/*===========================================================================*\
*                                                                           *
*                               OpenMesh                                    *
*      Copyright (C) 2001-2005 by Computer Graphics Group, RWTH Aachen      *
*                           www.openmesh.org                                *
*                                                                           *
*---------------------------------------------------------------------------* 
*                                                                           *
*                                License                                    *
*                                                                           *
*  This library is free software; you can redistribute it and/or modify it  *
*  under the terms of the GNU Library General Public License as published   *
*  by the Free Software Foundation, version 2.                              *
*                                                                           *
*  This library is distributed in the hope that it will be useful, but      *
*  WITHOUT ANY WARRANTY; without even the implied warranty of               *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU        *
*  Library General Public License for more details.                         *
*                                                                           *
*  You should have received a copy of the GNU Library General Public        *
*  License along with this library; if not, write to the Free Software      *
*  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
*                                                                           *
\*===========================================================================*/

#ifndef OPENMESH_PROGRESS_HH
#define OPENMESH_PROGRESS_HH


//== INCLUDES =================================================================

#include <Tools/Utils/Timer.hh>
#include <set>


//== FORWARDDECLARATIONS ======================================================

class ProgressHandler;


//== CLASS DEFINITION =========================================================


class ProgressManager
{
public:

	ProgressManager()  {}
	~ProgressManager() {}

	void connect(ProgressHandler* _ph)     { handlers_.insert(_ph); }
	void disconnect(ProgressHandler* _ph)  { handlers_.erase(_ph); }

	void set_steps(unsigned int _nsteps, const char* _label);
	bool step(unsigned int _steps=1);
	bool set_progress(unsigned int _progress);
	void finish();

	bool is_active() const { return active_; }
	bool was_cancelled() const { return cancelled_; }


private:

	std::set<ProgressHandler*>  handlers_;
	unsigned int                steps_, progress_, percentage_;
	bool                        active_, cancelled_;
	OpenMesh::Utils::Timer      timer_;
};


ProgressManager&  Progress();



//== CLASS DEFINITION =========================================================


class ProgressHandler
{
public:

	ProgressHandler() { Progress().connect(this); }
	virtual ~ProgressHandler() { Progress().disconnect(this); }

	virtual void set_steps(unsigned int _steps, const char* _label) = 0;
	virtual bool set_progress(unsigned int _progress) = 0;
	virtual void finish() = 0;
};


//=============================================================================
#endif // OPENMESH_PROGRESS_HH defined
//=============================================================================

